## setup

# clean environment
rm(list=ls())

# load packages
library(sandwich)
library(lmtest)

# load data
dat <- read.csv2("data_survey_csv.csv",
                 encoding = 'UTF-8')

# outcomes to numeric
dat$turkey <- as.numeric(as.character(dat$turkey))
dat$typical <- as.numeric(as.character(dat$typical))

## models

# column 1
mod_1<-lm(turkey ~ treatment, dat)

# column 2
mod_2<-lm(turkey ~ treatment + female + age + east + migback_resp, dat)

# column 3
mod_3 <-lm(typical~treatment,dat)

# column 4
mod_4 <-lm(typical~treatment + female + age + east + migback_resp, dat)


## robust standard errors

# column 1
mod_1_rob <- coeftest(mod_1, vcov = vcovHC(mod_1, "HC1"))

# column 2
mod_2_rob <- coeftest(mod_2, vcov = vcovHC(mod_2, "HC1"))

# column 3
mod_3_rob <- coeftest(mod_3, vcov = vcovHC(mod_3, "HC1"))

# column 4
mod_4_rob <- coeftest(mod_4, vcov = vcovHC(mod_4, "HC1"))


## show coefficients and standard errors
mod_1_rob
mod_2_rob
mod_3_rob
mod_4_rob
